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The chorionic membrane is the outer sac which surrounds the developing fetus
Protection
The placenta is the nourishing membrane around a fetus that grows from the inside of the mom's uterus. Your answer is, ". . . the mom . . ."
amniotic sack
homozygous
The membrane is called the Amniotic Sac, and the fluid is the Amniotic Fluid
A thin membrane surrounding the fetus and containing serous fluid.
The Amniotic Sac is the sac that contains the baby.
Placental membrane
The outer membrane which invests the fetus in the womb; also, the similar membrane investing many ova at certain stages of development., The true skin, or cutis., The outer membrane of seeds of plants.
The fetus needs calcium for its bones so fetus has its calcium from his mum during pregnancy so that most people say to the women who are pregnant to drink a lot of milk cause it contains calcium
A fetus will start producing IgM antibodies about 20 weeks into the pregnancy. The only antibody the fetus receives from it's mother is IgG which the baby will not start producing on its own until a few months after birth.